Automatic elevator plant.



C. 0. PEARSON & A. SUNDH. AUTOMATIC ELEVATOR PLANT. APPLICATION FILED SEPT.21,1908.

3 SHEETS-$111231 1.

INVENTORS COLUMBIA PLANOGRAPH co. WASHINGTON. D. c.

G. 0. PEARSON & A. SUNDH.

AUTOMATIC ELEVATOR PLANT. APPLIOATION FILED SEPT. 21, 190B.

Patented Feb. 3, 1914.

COLUMBIA PLANocRAvn co wAsnlNn'rok. D. C.

G. 0. PEARSON & A. SUNDH.

AUTOMATIC ELEVATOR PLANT.

APPLICATION FILED SEPT. 21, 1908.

1,085,937, Patented Feb. 3, 1914.

3 SHEETS-SHEET 3.

ATTORNEY COLUMBIA PIANOGRAPH $0.,WA5MINGTON. n. c.

UNITED STATES PATENT OFFICE.

CHARLES O. PEARSON, OF NEW YORK, AND AUGUST SUNDH, OF YONKERS, NEW YORK, ASSIGNORS TO OTIS ELEVATOR COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

AUTOMATIC ELEVATOR PLANT.

To all whom it may concern:

Be it known that we, CHARLES O. PEAR- SON and AUGUST SUNDH, citizens of the United States, and residents, respectively, of the borough of Brooklyn, in the county of Kings, city and State of New York, United States of America, and of the city of Yonkers, in the county of \Vestchester, State of New York, United States of America, have invented certain new and useful Improvements in Automatic Elevator Plants, of which the following is a specification.

Our invention relates to an automatic elevator plant, and its object is to provide a complete elevator installation including a power plant, and a control system, for both the elevator and its power plant by means of which various mechanisms may be controlled by the simple manipulation of an electric switch or push-button.

More specifically, the object of this invention is to provide a system of control in which an internal combustion engine may be'started at will and be automatically controlled, and the power developed by such engine be utilized in actuating an elevator.

Further objects of our invention will appear in the following specification in which we will describe the construction and arrangement of certain apparatus shown in the accompanying drawings as an illustration of a method in which the invention may be carried into efi'ect, and the novel features of which we will set forth in the appended claims.

Referring to the drawings, Figure l is a side elevation of an elevator apparatus and a power plant, together with some associated mechanisms, and with certain controlling switches with their connecting circuits shown diagrammatically. In Fig. 2 we have shown in side elevation, partly in section, an elevator installation made according to our invention, in which is shown the manner in which the parts thereof may be situated in separate buildings. Fig. 3 is a sectional side elevation of a portion of automatic floor stop switch which is a part of our improved control system. The connection between the spark timer mechanism of the engine and one of the magnets of the electrical control Specification of Letters Patent.

Application filed September 21, 1908.

Patented Feb. 3, 1914.

Serial No. 453,999.

system is shown in side elevation in Fig. 4, and a part of this connection is shown in plan view in Fig. 5. Fig. 6 is a side elevation, partly in section, of an engine starting device, a speed governor, and other parts which are connected with the engine. A detail of the engine starting mechanism is shown in section in Fig. 7. Fig. 8 is a sectional-end elevation of the starting device. Fig. 9 is a side elevation of a pressure pump and pressure regulator with some of the parts shown iii section to more clearly show their construction:

Like characters of reference designate corresponding parts in all of the figures.

1O designates the foundation or base upon which the various parts of the power plant are mounted.

11 is an internal combustion engine, and 12 is its shaft. four-cycle four-cylinder gasolene engine, but any other suitable form or type of engine may be substituted if desired.

13 is its intake or supply pipe.

14 is a carbureter to which gasolene is led by a pipe 15 from a supply tank 16 which, if desired, may be buried underground as shown in Figs. 1 and 9..

17 is the engine exhaust pipe which leads the burnt gases off through a muffler 18.

19 designates the spark-plugs for the engine.

20 is the ordinary spark timer mechanism which is driven from the engine shaft through a vertical shaft 21 and suitable gearing. This mechanism is connected by a rod 12 and abell-orank lever 23 with an clectromagnetically actuated device which will be described hereinafter.

let is an induction coil. Its secondary leads 25 and 26 connect, respectively, through the spark timing mechanism 20, with the spark-plugs 19 and with the frame of the engine to which the lead 26 is grounded.

27 is a storage battery, and 28 and 29 are its leads which are connected with the primary of the induction coil and with other parts of the apparatus by circuits which we will point out later.

Between the carbureter 14 and the intake This engine is shown as a of the engine is a regulating valve 30. This is shown somewhat in detail in Fig. 6' in which it appears that 31 is a piston valve cut away at 32 and interposed in the passage supply pipe 13. 33 is a piston rod extending upward from the piston to a lever 34 which is pivoted at 36 is a centrifugal governor which is arranged to move the lever 34 and, through the connections just pointed out, to actuate the governor valve 30 and another valve which will be pointed out later. This governor is driven by a vertical shaft 37 by means of a bevel gear 38 on the lower end of shaft 37, which gear is in mesh with a similar bevel gear 39 on the end of engine shaft 12.

ll designates the cylinder of a pressure pump 40. Vithin this cylinder is a piston 42 which is driven by an eccentric 43 upon engine shaft 12.

4:4 is an intake valve in the pump of cylinder 41, and 45 is the outlet valve. The outlet or passage is connected by a pipe 46 with the pressure tank 47.

48 is a diaphragm pressure regulator which is arranged to actuate a relief valve 49 whenever the pressure within tank 47 exceeds the desired amount.

50 is a fluid pressure starting device for the engine. It comprises a cylinder5l within which is the piston 52 pressed upward by means of a compression spring 53. The

lower end of the piston rod is constructed to. form a toothed rack .54 which is in .mesh' with a gear 55 loosely mounted upon the en. gine shaft 12. The gear 55 is provided with.

a flange 56 on one side, upon whichispivotally supported a pawl 57. This. pavjvlt is spring'pressed into engagement with a ratchet-wheel 58 whenevertheflange-is ro-3 tated. The wheel 58 is keyed or otherwise rigidly affixed to the engine shaft 12.

59 is a pin arranged to strike on the pawl 57 to raise the pawl out of engagement with the ratchet-wheel while the starting device is at rest.

When air or other fluid pressure is admitted to the top of cylinder 51, the piston will be depressed and, through the connections above described, will cause the engine shaft to be rotated. The engine will then draw in an explosive mixture and will start to run under its own power. As soon as pres sure is released from cylinder 51, the spring 53 will return the parts of the starting device to their initial positions. I

60 designates a circulating pump for the engine which is driven by the latter and isarranged to draw water from a tank 61 through a pipe 62 and to force it through pipe 63 to the cooling jacket of the engine cylinders.

64 is the return pipe from the water jacket to the tank 61. V 7

70 designates an elevator hoisting apparatus which comprises an electric motor 71 and a hoisting drum 72 connected together by suitable gearing.

7 3 is the drum shaft.

A car 74 and counterweight 75 are connected with the hoisting drum by cables in the usual manner.

'76 a pinion gear on the end of shaft 73 which is in mesh with a slidable toothed bar 77. On one part of this bar a pair of contact plates 78 and 79 are mounted. These plates are insulated from the bar and from each other.

designates a brake-pulley which is rigidly mounted upon the motor shaft.

66 is a brake-shoe mounted upon a pivoted lever 67 which is pressed upward by a spring 68 so that the brake-shoe is in contact with the pulley 65..

69 is an electromagnetor solenoid, so arranged that when it is energized it will pull the brake lever down against the action of spring-68 and release the brake.

8O designates the door a the elevator shaft at the lower landing or floor: 80 is a similar door at the middle floor; 80 is the door at the upper landing.

81, 81 and, 81 are door contactsithrough which oneofthe circuits of the control system passes whenthe doors are all closed. j'Whenany of the doors are open, .itsg'door contact is opened, as shown at 81 at the second floor.-

; S2 is a push-buttonthe hall fat the first floor,- which is normally held-openv by a spring, but whichmay be manually pressed againsta stationary contact 83. 84 is a similar push -button at the second floor, and 185 -the contact against which it maybe moved.- 86 and87 are, respectively, the push-button and its contact at the third floor.- -88 is a conductor connecting these three Push-buttons. More landings with their pushbuttons might be shown, but we believe that three of these are suflicient to illustrate the operation of the invention.

90 is a conductor leading to three pushbuttons 91, 92 and 93 in the car, which pushbuttons correspond with the three landings at which the car is arranged to stop. The conductor 90 is connected with these three push-buttons through a safety push-button 100 is the winding of a floor-control switch magnet, one end of which is connected with the conductor 96 and its other end connected with a common return wire 101. This floorcontrol magnet is shown on a larger scale and somewhat in detail in Fig. 3, in which figure it may be seen that it comprises a core 102 which is normally held in a raised position by a sprin 103. It also has a contact rod 104 depen ing from its core and arranged to be moved down into position to touch one of the sliding contacts 78 or 79 when the winding 100 is energized, and when either of these contacts is directly below it. The conductor 96 is also connected with the contact rod 104. 105 is the winding of a similar floor-control magnet which is connected with the conductors 98 and 101, and controls a contact rod 106 which is also connected with conductor 98. 107 is the windingof a third floor-control magnet which is connected with the conductors 89 and 101. This magnet controls contact rod 108 which is connected with conductor 89.

Returning to the, power plant, it may be seen that an electric generator 110 is directly connected with the engine 11 by having its shaft coupled to the engine shaft 12. 111 and 112 are the leads from its armature, and 113 and 114 the leads from its shunt field Winding. Y

120-and 121 are the windings of an electromagnetically actuated reversing switch. These are arranged to raise certain insulated contact plates against stationary contacts in a manner which will be pointed out in describing the operation of ourinvention.

130 and 131 are the windings of an electromagnet which is arranged when energized, to cause the motor 11 to be started and to perform other functions in conjunction therewith. 140 is the winding of a controlling magnet which is arranged to actuate the spark timing mechanismand the spark coil for the engme, and to cooperate with the other parts of the control system. These magnets control certain circuits and apparatus which we will point out more fully in describing the operation of the invention, which we will now proceed to do.

If a person on the first floor of a. building in which the elevator is installed pushes button 82 against contact 83, a circuit will thereby be completed, if all the hatchway doors are closed, from battery 27, through conductors 28, 150 and 88, the push-button and its contact, conductor 96, through winding 100 and conductors 101 and 29, back to the battery. This will energize the first floor control magnet and cause it to pull conductor 104 down against the sliding contact 79 which will be in the position shown if the car 74 is opposite the second floor. This will now complete a circuit from the battery through the conductors already pointed out, to and through conductor 150. Thence, the new circuit will continue through conductor 151, winding 130 of the starting switch, and conductor 152 to the slidable contact plate 79. Thence, it will continue through the magnet winding 100 and conductor 101 back to the battery. The operator may then release button 82 without breaking the circuit through magnet 100. As the magnet winding 130 is now energized, it will raise the core or plunger 132. This will open valve 133 which is interposed between the pressure supply pipe 115 leading from the pres sure tank 47, and pressure pipe 116 which leads to the top of cylinder 51 of the starting device. This, as has been pointed out, will rotate the engine. At the same time contact plate 134 will be moved up until it bridges stationary contacts 135 and 136 and thereby closes a circuit by conductors 153 and 154 through the primary winding of the induction coil 24. This, then, will supply current for the igniter mechanism of the engine, so that -the latter will run under its own power. At the same time, another contact plate 137 will be raised up until it bridges stationary contacts 138 and 139. This, through conductors 155 and 156, will connect the winding 140 across the battery. Energizing magnet 140 causes it to raise its core 141 and, through the latter and bell crank lever 23 and the connections heretofore pointed out, to actuate the spark timer mechanism to advance the spark and to thereby increase the speed of the engine in the usual manner. The contact plate 142 will be raised up against stationary contacts 1-13 and 114 to close the generator armature leads 111 and 112 across the battery 27 by means of conductors 28 and 117. The contact plate 145 will also be raised up against contacts 146 and 147 to complete the circuit through winding 121 of the reversing switch. This circuit runs from the battery through conductors 28, 150 and 151, contact 147, contact plate 145, and contact 146, conductor 118, winding 121, conductors 149 and 152, sliding contact plate 79, contact rod 104, winding 100, and conductors 101 and 29 back to the battery. The operations above described will cause the engine to be automatically started and brought up to its normal speed which will be governed by the throttle valve 30. At the same time the governor will actuate a valve 158 through a connec' tion 159 to cut oil the pressure supply from cylinder 51 and to open same to the air so that the spring 53 may return the piston 52 and the parts which it controls to their normal positions. The generator 110 will now be driven by the engine to supply electrical energy for driving the elevator motor 71 and for energizing the battery 27 and the control circuits. This will be because its shunt field winding, which is connected across the armature leads, will also be connected across the battery 27 by the circuits shown as soon as contact plate 142 bridges stationary contacts 143 and 144. The elevator motor 71 is arranged to be. driven by the current generated by the dynamo 110. To attain this end the motor armature leads 160 and 161,

which are'indicated in the drawings by heavy broken lines, and the motor field leads 162 and 163, Which are indicated in the drawings by light broken lines, are led to the reversing switch and connected thereto in the manner shown. The circuit through winding'121, which has been traced, will cause the right-hand side of the reversing switch to be actuated. This will cause the dynamo main 112 to be connected with the motor armature lead 161 by contact plate 122 and the main 111 throu h conductor 29 and contact plate 123 with t e motor armature'lead 160, The motor field lead 163 is permanently connected with conductor 29 which is connected with one of the mains of the generator, and when the contact plate 124 is raised, the motor field lead 162 will be connected thereby with the other main 112 from the generator. Therefore, the elevator motor will be supplied with current, and as the brake magnet 69, which is connected by conductors 118 and 119 with the conductors 160 and 161, will also be energized to' release the brake, the motor will then rotate in one direction. The connections between the elevator inotor and car 74 are'suchthat this rotation of the motor will causethe car to'be moved downward. The downward movement of the car will cause the sliding bar 77 to be moved to the left, and the parts are so proportioned that when the car has 'about reached the lower landing, the slidable contact 79 will be moved out of contact with the contact rod 104, thus breaking the circuits which it controls.

- This means that the magnet windings 100,

130, 140 and 121 will be deenergized, and that the parts which they control will return to their first positions. The current from the motor will thus be cut off and the brake applied, so that theelevator-car will automatically come to rest at the first floor. The current supplying the ignition sparks for the engine will also be cut off so that the engine will also come to rest. In the mean time any excess of electrical energy which has been developed by the generator 110 will be stored in battery 27, and the pump 40 will have recharged the pressure tank 17. The electrical energy stored in the battery 27 will also be available in starting the elevator, as at this part of the operation an excess of current is often desired. It may be seen that if any of the hatchway doors had been opened, the operating circuit would have been broken, so that the car could not have been started. i

A similar operation to that above described would take place if a passenger should enter the car at the second floor, and, after having closed the door '80, should push the button 91. In that case the current for first energizing winding 100, will pass from conductor 150, through conductor 90 and the push-button 91 and its contact 95 to conductor 96; otherwise the operation will be the same as before more specifically described. If the button 86 on the top floor had been closed against its contact 87 ,a similar operation would have taken place, except that in this case the winding 107 would have been energized to pull contact rod 108'dow'n against slidable cont-act 78 which, through conductor 157, would "close the circuit through winding 131 of the startingswitch.

This would have the same effect, as the ene'rgization of winding 130 had upon the'starting switch, but is connected to energize the winding 120 instead ofthe winding'12'1' ofthe reversin switch. Two co'res 'a're shown for the starting switch, but this is done only for the sake of clearness in tracing the-two circuits through windings 130mm 131. As;

plates 125, 126 and 127 and these will close the same circuits as those previouslydescribed. But in this-case the motor'armature leads 160 and 161 willbecon'nected, re-' spectively, with conductors- 112 and 29- so that the current will pass through the motor armature in theopposite direction to that before traced, and will'cau'se the motor" to rotate in the opposite direction or in 'the'direction to 'raisethe car. 'When" the car reaches the top floor it will be stopped by the slidablc contact plate"78'havingbeen moved over to the right and from under thecontact rod 108. The contact rod'=106 will touch either contact 78 or 79, according to the position of the car, so that if the car is above the second floor when push-button '84 is de pressed, itwill come down to that floor, or, if the car is below the second floor it will come up. Of course, any desired number of landings may be equipped with the controlling buttons and their corresponding floor controlling magnets, but we believe'that the three stations which are illustrated and described are suflicient to fully disclose this part of our invention.

lVe have shown an elevator apparatus and a power plant therefor which may be installed together, or may be two separate in stallations removed from each other, or in different buildings, if desired. The latter arrangement is shown in Fig. 2. This, in many instances, is desirable. In such cases a switchboard 164 may be placed near the elevator hoisting apparatus which may entirely disconnect the power plant if desiredor render the elevator machine inoperative. When elevators are desired in country residences, where no supply of energy for driving such apparatus is available, this in-: vention is especially useful. The power; plant may be set up at a point removed from the dwelling and connected therewith only by electrical conductors. All the advan tages of an automatic electric push-button elevator may thus be obtained in places hitherto without such conveniences. Other types of elevators than that herein; described may "be installed under this in-' vention as its scope is not'at all. limited by: the specific illustration shown. The econ; omy of operation is apparent, for the power} plant is running only during such times as it is needed for driving the e evator. f This invention increases the scope of ap-i plication of gasolene or other internal com-i bustion engines and opens a new field of usei fulness for them, .No skilled attendant is} necessary forsuch an installation aswe have described as the entire operation 'of the power; plant is automatic and the elevator is started thesimple manipulation ofv a push-button and stops automatically .at the desired floor, at thejsamev time causing ,the

control system to shut 'down'the power plant until such .a time as it is ldesired torusethe 3 elevator again. I v

tor, a primemover; for supplyingene rgy as mo iianually =Jn ll l s s a: t i -and v n uellin ai r n mo r to s rt a d ce re! theavt oaetthe levat lmeans erst pp i t tor and the prime mover toget er, r

in r. :A ti omp i ina hei tm m p m dv r i nuppl ing en r y t9 said. motor, manually controlled .deviees at the elevator for, starting and controllingv the prime mover to start and control the action of the elevator, and automatic means for stopping the elevator and the prime mover together. Q l I 3. An elevator comprising a hoisting motor, a separate prime mover therefor, connections between, the prime mover and the elevator motor for supplying energy to said motor, a single control system for both the primemover and the elevator motor, said system comprising manually controlled .de vices at the elevator, connections between said devices and the primemover arranged to start the prime mover and the elevator motor, and devices for stopping the prime mover and the elevator together.

4. An elevator comprising a hoisting motor, a separate prime mover therefor, connections between the prime mover and the elevator motor for supplying energy to said motor, a single control system for both the prime mover and the elevator motor, said system comprising manually controlled devices at the elevator, and connections between said devices and the prime mover arranged to start the prime mover and the elevator motor; means for controlling the prime mover and the direction of movement of the elevator, and automatically actuated devices for stopping the prime mover and the elevator together.

. 5. An .elevator comprising an electric motor, an electric generator for supplying current to the motor, electric connections be tween the elevator and the generator, a single electrical control system for both the elevator and the generator, said system comprising manually controlled switches, and electromagnetieally actuated switches whereby the generator and the elevator may be started together. 6.;' AJ1 elevator comprising an electric motor, an electric generatorfor. supplying cur.- rent to the motor, electric connections betweenthe elevator and the generator, a single lectricalfcontrol system for both the elevator and the generator, said system comprising manually controlled switches and electromagnetieally actuated switches whereby, the generator and -the elevator may be started together at andcircuit breakers arranged to ,be automatically actuated by-the j elevator for' stopping the, elevator and the en rat t r- 7.,An elevator comprising a. motor and car arranged to stop .at different floors, an eas er; dr ve g ner i pp yi g ner t e e at r o o Y tern for-both the elevatonand the generator, said systemvcomprising manually controlled devices arranged to start the generatorand the-elevator; together, and I automatically, actuated devices arranged to stop jtheelevator and the generator together. when the car reachesa desired floor. v M V 2;.

8..A11 elevator comprising a motor and a car arranged to stop atdifferent-floors,- a generator for supplying energy tothe elevator motor,.a control system for both the elevator and the generator, said system comprising manually controlled devices at the elevator arranged to start the generator and the elevator together,;and devices automaticallyactuated by the movement of the car arranged'to stop the elevator and the generator together when the car reaches a desired floor. a v

p 9. An elevator comprising an electric motor and a car arranged to stop at different floors, a generator for supplying electric energy to the elevator motor, an electrical control system for both the elevator and the generator, said system comprising circuits, manually controlled switches insaid circuits at the elevator, and means controlled by said switches for starting the generator and the elevator together; and floor controlled switches automatically actuated by the movement of the car arranged to stop the elevator and the generator together when the car reaches a desired floor.

10.- An elevator, a motor therefor, a power plant for supplying energy to the motor, said power plant comprising an internal combustion engine, intermediate connections between the power plant and the motor; a control system for the power plant and the motor, said system comprising de vices for starting the power plant to start the motor, and other devices for stopping the power plant and the motor together.

11. An elevator, a motor therefor and a car arranged to stop at different floors, a power plant for supplying the energy to the motor, said power plant comprising an internal combustion engine, intermediate connections between the power plant and the motor; a control system for the power plant and the motor, said control system comprising manual devices for starting the power plant to start the motor, and automatic devices for stopping the power plant and the motor together when the car reaches a desired floor.

12. In an elevator a car and an electric motor; an internal combustion engine connected to a-dynamo for supplying current Vto'sa'id motor, a starting device for the engine, electrical connections between the dyname and-the motor, and a control system comprising'devices for simultaneously starting, stopping and controlling the engine and motor, connections being so arranged that the elevator motor is started, stopped and controlled by the similar actions of the engine,

13. In an elevator a car and an electric motor; an internal combustion engine and a dynamo driven thereby, a device for start ing the engine, and a control system connecting the motor and the dynamo, said system comprising manually controlled switches arranged to control the engine starting device and the motor, and devices automatically actuated by the movement of the motor for stopping the engine.

-14.- An elevator, a motor for operating the elevator, a source of electric power comprising an engine and connected dynamo, a starting device for the engine arranged to be actuated by energy generated by the engine itself, a control system for the elevator and the source of electric power, said control system being energized by a supply of cur rent generated by the engine, and comprising manually operated devices for controlling the engine starting device and the elevator, and automatically actuated devices for stopping the engine and the elevator to gether.

15'.- An elevator, a power plant therefor,

said power plant comprising an engine, a starting device for the engine, an electrical control system for the elevator and the power plant, means also driven by the engine for generating an electrical supply for said system, said system comprising manually operated devices for controlling the engine starting device and the elevator, and automatically actuated devices for stopping the engine and the elevator together.

16. An elevator, a power plant there-for, said power plant comprising an engine, a starting device for the engine, a dynamo driven by the engine, a storage battery, and a control system for the elevator and the power plant, said control system being energized by the electrical energy from the battery and comprising electromagnetic devices for controlling the engine starting device and the elevator.

17. An elevator having a car arranged to stop at different floors, and an electric motor; a power plant for the elevator, said power plant comprising an internal combustion engine, a starting'device for the engine, an electropneumatic valve arranged to control the starting device, a dynamo driven by the engine, a storage battery connected therewith, and a control system for the elevator and the power plant, said control system being energized by electrical energy from the storage battery and comprising manually operated switches, circuits connecting said switches with the electropneu-,

matic valve, whereb' the power plant and the elevator may e started, and other switches automatically actuated by the movement of the car for stopping the power plant and the elevator when the car reaches a desired floor. I

18. In an elevator having a car arranged to stop at different floors, an electric motor arranged to drive the elevator; an internal combustion engine connected to a dynamo, a starting device for the engine, an electropneumatic valve for controlling the starting device, a storage battery connected with the dynamo, a throttle valve for controlling the speed of the engine, a centrifugal governor driven by the engine and arranged to actuate the throttle valve; and a control system for the elevator motor, engine and dynamo, said control system being energized by electrical energy from the storage battery and comprising manually operated switches, circuit connecting said switches with the electropneumatic valve whereby the engine and the elevator motor may be started, and other switches automatically actuated by the movement of the car for stopping the engine and the elevator motor when the car reaches a desired floor.

19. In an elevator a car arranged to stop at different floors, and an electric motor; an internal combustion engine, a starting device for the engine, an electropneumatic valve for controlling the starting device, a dynamo driven by the engine, a storage battery connected with the dynamo, a throttle valve for controlling the speed of the engine, a centrifugal governor driven by the engine and arranged to actuate the throttle valve; a control system for the elevator and the engine, said control system being ener gized by electrical energy from the storage battery and comprising means for actuating the starting device to start the engine and to thereby start the elevator motor, and a valve actuated by the centrifugal governor arranged to release the starting device after the engine has attained a desired speed, said control system also comprising automatic switches for stopping the elevator and the engine when the car reaches a desired floor.

20. In an electric elevator, an electric motor, a hoisting apparatus and a car; a generator for the elevator, an automatic control system for the elevator, said control system comprising push-buttons arranged to start the generator and the elevator, and floor-control switches arranged to stop the generator and the elevator.

21. In an electric elevator, an electric motor, a generator for the motor, electric connections between the motor and the generator, and an automatic control system for the motor, said control system comprising push-buttonsarranged to start the generator and the motor, and floor-control switches arranged to stop the generator and the motor.

22. In an electric hoisting elevator, an electric. motor, a car arranged to stop at different floors, a generator for the elevator motor, a wiring system for the elevator motor and the generator, a push-button at each floor, each of said push-buttons being connected with devices arranged to start the generator and the elevator motor, and means actuated by the movement of the hoisting apparatusto stop the elevator motor and the generator when the car reaches the floor at which a push-button has been depressed.

23. In an electric elevator, an electric motor, a hoisting apparatus, and a car arranged to stop at different floors; a generator for the motor, a wiring system for the motor and the generator, at push-button at each floor, a floor magnet corresponding with each floor, each of said push-buttons being arranged, when depressed, to energize one of said floor magnets, and means for thereby starting the generator and the elevator; and switches automatically actuated by the movement of the hoisting apparatus arranged to deenergize said floor magnet when the car has reached the floor at which the button has been depressed.

24. In an electric elevator, an electric motor, a hoisting apparatus, and a car arranged to stop at different floors; a generator adapted to supply current for the elevator, a wiring system for the elevator and the generator, a push-button at each floor, a floor-magnet corresponding with each floor, circuits therefor, a pair of slidable contactplates arranged to coooperate with the floormagnets each of said push-buttons being arranged, when depressed, to energize one of the floor magnets and to close a circuit through one of the slidable contact-plates, and means for thereby starting the generator to start the elevator in one direction; means for causing said slidable contact-plates to be moved by the movement of the hoisting apparatus to break said floor-magnet circuit when the car has reached the floor at which a push-button has been depressed and to cause the elevator and the generator to stop.

25. In an electric elevator, an electric motor, a hoisting apparatus, and a car arranged to stop at different floors; a hatchway door at each floor, door contacts actuated by said doors; a generator adapted to supply current for the elevator, a wiring system for the elevator and the generator, a push-button at each floor, a plurality of push-buttons in the car corresponding with each floor, a floor-magnet corresponding with each floor, circuits therefor, a pair of slidable contact-plates arranged to cooperate with said fioor magnets, means for causing each of said push-buttons when depressed to energize one of the floor magnets to close a circuit from the door-contacts and through one of the slidable contacts to thereby start the generator and to start the elevator in one direction; means for causing said slidable contacts to be moved by the movement of the hoisting apparatus to break said floor magnet circuit when the car has reached the fioor for which a button has been depressed, and to cause the elevator and the generator to stop.

26. An elevator, a power plant therefor comprising an engine, electroresponsive devices arranged to control the starting of the engine, the speed thereof, and the direction of travel of the elevator, and a control system for controlling said electroresponsive devices.

27. An elevator having an electric hoisting motor, a generator for supplying current to said motor, a control system for both the elevator and the generator, said control system comprising an electromagnetically actuated starting switch, a speed control switch for the generator, and a reversing switch for the elevator.

28. An elevator, a power plant therefor comprising an internal combustion engine, a starting device therefor, a sparking mechanism for the engine, and a control system for both the elevator and the power plant,

said system comprising an electromagnetically actuated switch arranged to control the starting device current for the sparking mechanism to start and to stop the engine; and a reversing switch for the elevator.

29. In an elevator, an electric motor, a

ower plant for the elevator comprising an internal combustion engine, a starting device therefor, a sparking mechanism for the engine, and a control system for the elevator and the power plant, said system comprising an electromagnetically actuated switch arranged to control the starting device and the current for the sparking mechanism to start and to stop the engine; an electromagnetically actuated switch for shifting the sparking mechanism, and an electromagnetically actuated reversing switch for the elevator motor.

30. In an electric elevator,an electric m0- tor, a hoisting apparatus, and a car; a power plant for the elevator, said power plant comprising an internal combustion engine and a dynamo driven thereby, a dev ce for starting the engine, a wiring system connecting the motor and the dynamo; and an automatic push-button control system arranged to control said starting means, said system comprising means for controlling the engine-starting device, and a reversing switch for the elevator motor.

31. In an electric'elevator," an electric motor,a hoistin apparatus, and a car arranged to stop at di erent floors; a power plant for the elevator, said power plant comprising an engine, a starting device for the engine arranged to be actuated by energy generated by the engine itself, a control system for the elevator and the power plant, said'control system also being energized by a supply generated by the engine and comprising a push-button at each floor, and means for causing each of said push-buttons, when depressed, to start the power plant and the elevator, and other means actuated by the movement of the hoistingapparatus to stop the elevator and the power plant when the car reaches the floor at which a push-button has been depressed.

32. In anelectric elevator, an electric motor, a hoisting apparatus, and a car arranged to stop at different floors; a power plant for the elevator, said power plant'comprising an engine, a starting device for the engine, a dynamo driven by the engine, a control system for the elevator and the power plant, said control system being'energized by the electrical energy from the dynamo and comprising a push-button at each floor, a floormagnet corresponding with each floor, circuits therefor, and means for causing each of said push-buttons, when depressed, to energize one of said floor magnets; means controlled by the euergization of said magnet for actuating said engine-starting device to start the power plant and the elevator, and means actuated by the movement of the hoisting apparatus for automatically deenergizing said floor magnet. when the car reaches the floor for which a push-button has been depressed.

33. In an electric elevator, an electric motor, a hoisting apparatus, and a car arranged to stop at different floors; a power plant for the elevator, said power plant comprising an internal combustion engine, a starting device for the engine, a dynamo driven by the engine, a storage battery connected therewith, an electropneumatic valve for controlling the engine-starting device, and a control system for the engine and the power plant, said control system being energized by electrical energy from the storage battery, and comprising a push-button at each floor; a fioor-magnet corresponding with each floor, circuits therefor, a pair of slidable contact-plates arranged to cooperate with said floor-magnets, and means for causing each of said push-buttons, when depressed, to energize one of the floor magnets to close a circuit through one of the slidable cause the elevator and the power plant to stop. v

34. In an electric elevator, an electric motor, a hoisting apparatus, and a car arranged to stop at difl'erent floors; a hatchway door at each floor, door contacts actuated by said door; a power plant for the elevator, said power plant comprising an internal combustion engine, a starting device for the engine, an electropneumatic valve for controlling the starting device, a dynamo driven by the engine, means for automatically governing the speed of the engine, and a control system for the elevator and the power plant, said control system being energized by the dynamo and comprising a push-button at each floor, a plurality of push-buttons in the car corresponding with each floor, a floor-magnet corresponding with each floor, a pair of slidable contact-plates arranged to cooperate with said floor-magnets, means for causing each of said pushbuttous, when depressed, to-euergize one of the floor-magnets to close a circuit through the door contacts and through one of the slidable contact -'plates, and means for thereby actuating the electropneuma-tic valve to start the engine and to start the elevator in one direction; and means for mov ing said slidable contact-plate by the movenames to this specification in the presence of ment of the hoisting apparatus to break said two subscribing witnesses.

circuit when the car has reached a floor for CHARLES O. PEARSON. which a push-button has been depressed to AUGUST SUNDH.

cause the elevator and the power plant to \Vitnesses:

stop. ERNEST W. MARSHALL,

In testimony whereof we have signed our ELLA LUOE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

